Agreed, but they are well on their way and can only get better where Apple will just come up with another device to tempt you in to having 3 or 4 or 5 pieces of their hardware.A philosophy without a successful implementation is nothing more than a pipe dream... it is only validated when there is a successful implementation.
Of course those with greater needs may never be satisfied with one device or simply the convenience of having a little consumption device is always tempting. Considering most have a smartphone and a laptop/desktop what goes in between or compliments in Apple world is a series of stepped/restricted compromises to boost sales of hardware
There is nothing wrong with an Ipad and if it fits your needs then you probably do not need any laptop and the same would be true for any non full OS tablet. You simply pick the interface you like and Apple do this very well.
The difference with a full OS tablet is it is far more capable of growing with your needs and skills where the Apple tablets keep you in a nannie state till your forced in to buying a Mac, then you can't do what you expected after coming from a touch interface, there is no natural progression just different hardware platforms for different tasks/requirements.
MS aims and goals are the reverse of what Apple offer in this respect, of course they have some way to go but there will not be the same jump or restrictions going from a desktop - laptop - tablet - phone that exist in Apple.
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I do all of the on my iPad and have published three books in the last year.
If you want a Windows PC in a tablet form, buy a Surface Pro. If you want a tablet that will do what you say you want to do, the iPad is brilliant.
It seems you have the right tool for your needs and that's what counts, congrats on your 3 books